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Chempak No4


Slow release Eucalyptus fertiliser.

Expert-approved food to help you grow the perfect Eucalyptus tree.

Sizes Quoted are the approximate height band of the tree above compost level, ie. the height of the tree once planted into the ground. Please note: Eucalyptus are living plants and can grow almost all year round, occasionally we may supply you with a plant that is slightly taller than your order. If this might cause you problems, please include a note with your order.

Click the dropdown below to view our different sizes & prices.



Why use this product?

Eucalyptus grow extremely quickly, throwing out masses of foliage and branchlets with gay abandon, well into the later summer. Their new seasons growth can be quite floppy early on; they sort of forget to lay down scaffolding in their trunk and branches as they grow. In the nursery, we find that they don’t really lignify (firm up) until November, often after the first frosts and this late tender growth can get scorched.

This is of particular concern if you are growing for cut foliage.

A readily available source of soluble potassium helps do many things for your Euc. It helps towards protecting against frost damage by encouraging your tree to produce and ripen (harden) woody material.

Potassium is a very soluble salt that washes away from your soil very quickly. It needs replenishing on a regular basis.


Chempak No. 4 is a highly soluble, balanced plant food containing some Nitrogen and Phosporous, but high in Potassium along with 7 trace elements, far more than ordinary fertilisers. Think plant equivalent of baked beans on toast with added vitamin pills!


Time of year to apply: any time from May through to September is good, but especially during August and September


Dosage and Rate of Use: 2 level measures of Chempack crystals in 5 litres (about 1 gallon) of water.  If growing in the ground for cut foliage, apply Chempack once a month, in season, during the first 2-3 years of planting in your garden. If growing in a container, feed your potted Eucalyptus once every 2 weeks, during the growing season.

Additional information

Weight 0.9 kg
Dimensions 30 × 20 × 20 cm

How to Use

Timing application is important:

For optimum results; use RootGrow mycorrhizal fungi at the time of planting, followed by a root drench of Alg-a-mic Seaweed Biostimulant  4 days after planting. The seaweed product works in conjunction with the young mycorrhizal fungi as they begin colonisation, ‘supercharging’ the development of your Eucalyptus root system.

A healthy root system is essential for the efficient uptake of soil-based nutrients, which is why you will need to wait a few weeks for the roots to grow before using  Chempack fertiliser on potted grown Eucs or Smart Fertiliser for Eucs planted in the ground. All of these products combined, and carefully timed, lead to faster establishment and a stronger, hardier plant.

For newly planted stock: Apply Chempack 6 weeks after potting on or planting out your new tree.  Latest application date is during September.

For established stock: being feeding from end of March/mid-April, depending on the season and where you live in the UK. The further north you live, the later you will want to begin feeding your plants at the start of the growing season.

For pot-grown Eucalyptus – feed every other week, during the growing season.   For a cut foliage crop in your garden, feed once a month.  Feeding should not continue much beyond mid-September for both new and established trees, depending on where you live in the UK.


Dosage and Rate of Use:  Follow the manufacturers instructions on the packet





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